POLITICO: September 20, 2016. Written by Marc Caputo, Craig Pittman, and Christopher O'Donnell.

Last month, when a 300-foot-deep sinkhole opened up at a phosphate plant in Mulberry, draining acidic waste into the aquifer below, the owner, fertilizer industry giant Mosaic, alerted the Florida Department of Environmental Protection, the U.S. Environmental Protection Agency and Polk County.